Cl(O)(=O)(=O)=O.[Cl:6][C:7]1[CH:12]=[CH:11][C:10]([C:13](=NC)[C:14]2[N:18]([CH3:19])[C:17]([CH2:20][C:21]([O:23][CH3:24])=[O:22])=[CH:16][C:15]=2[CH3:25])=[CH:9][CH:8]=1.C(=O)(O)[O-:29].[Na+].S(OC)(OC)(=O)=O.C([O-])(=O)C.[Na+]>CO.O>[Cl:6][C:7]1[CH:12]=[CH:11][C:10]([C:13]([C:14]2[N:18]([CH3:19])[C:17]([CH2:20][C:21]([O:23][CH3:24])=[O:22])=[CH:16][C:15]=2[CH3:25])=[O:29])=[CH:9][CH:8]=1Methyl 5-[(4-chlorophenyl)(methylimino)methyl]-1,4-dimethyl-1H-pyrrole-2-acetate perchlorate (1.5 g, 3.6 mmole) was treated with saturated aqueous sodium bicarbonate and extracted with chloroform (50 ml). The organic phase was dried over magnesium sulfate, filtered and concentrated. The residue was treated with dimethyl sulfate (0.62 g, 4.9 mmole) and heated at ~40° C. for one hour. The viscous reaction mixture was dissolved in methanol (10 ml) and treated with sodium acetate (2 g, 24 mmole) and water (2 ml) and heated at reflux overnight. The reaction was cooled and diluted with water (5 ml). The crystalline solid was isolated by filtration, washed with water, air dried, and recrystallized from methanol (10 ml) to yield 0.71 g (65%) of the title compound as a tan solid, m.p. 125°-131° C.
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